﻿/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * Copyright (c) The DotNetty Project (Microsoft). All rights reserved.
 *
 *   https://github.com/azure/dotnetty
 *
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 *
 * Copyright (c) 2020 The Dotnetty-Span-Fork Project (cuteant@outlook.com) All rights reserved.
 *
 *   https://github.com/cuteant/dotnetty-span-fork
 *
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */

namespace DotNetty.Common.Concurrency
{
    using System.Threading;

    abstract class ScheduledAsyncTask : ScheduledTask
    {
        private readonly CancellationToken _cancellationToken;
        private CancellationTokenRegistration _cancellationTokenRegistration;

        protected ScheduledAsyncTask(AbstractScheduledEventExecutor executor, long deadlineNanos, IPromise promise, CancellationToken cancellationToken)
            : base(executor, deadlineNanos, promise)
        {
            _cancellationToken = cancellationToken;
            _cancellationTokenRegistration = cancellationToken.Register(s => ((ScheduledAsyncTask)s).Cancel(), this);
        }

        protected ScheduledAsyncTask(AbstractScheduledEventExecutor executor, long deadlineNanos, long periodNanos, IPromise promise, CancellationToken cancellationToken)
            : base(executor, deadlineNanos, periodNanos, promise)
        {
            _cancellationToken = cancellationToken;
            _cancellationTokenRegistration = cancellationToken.Register(s => ((ScheduledAsyncTask)s).Cancel(), this);
        }

        public override void Run()
        {
            _cancellationTokenRegistration.Dispose();
            if (_cancellationToken.IsCancellationRequested)
            {
                _ = Promise.TrySetCanceled();
            }
            else
            {
                base.Run();
            }
        }
    }
}